Atom

Question 1

Atom

Answer 1

The smallest particle of an element that can exist.

Question 2

Isotope

Answer 2

Isotopes of an element have the same number of protons (same Z), but a different number of neutrons (different N).

Question 3

Energy Level

Answer 3

A definite value of energy possible for an electron, either in the ground state or an excited condition.

Question 4

Ground State

Answer 4

When the electrons in an atom have their lowest possible energies.

Question 5

Excited State

Answer 5

When the electrons in an atom have absorbed energy (like heat) and are not in ground state.

Question 6

Atomic orbital

Answer 6

An atomic orbital is the region in which an electron may be found around a single atom.

Question 7

Valence energy Level

Answer 7

The outermost energy level of an atom.

Question 8

Valence electrons

Answer 8

The electrons in the outermost energy level of an atom.

Question 9

Core electrons

Answer 9

All the electrons in an atom, excluding the valence electrons.

Question 10

Lone Pair (of electrons)

Answer 10

A pair of electrons occupying an orbital in an atom or molecule and not directly involved in bonding.

Question 11

Unpaired electron

Answer 11

An electron that occupies an orbital of an atom singly, rather than as part of an electron pair.